[jdk8u-dev] RFR: 8318039: GHA: Bump macOS and Xcode versions

[Zdenek Zambersky]

This backport is written from scratch, as GHA workflows in jdk8u differ significantly from newer jdk versions.

Notes:
- additionally installed `gawk` to prevent build error on newer macos (see my [comment](https://github.com/openjdk/jdk17u-dev/pull/2206#issuecomment-2217722646))
- interestingly, unlike newer jdks (11, 17), additional backports do not seem necessary to pass the build, probably build system of jdk8 is more relaxed, when it comes to warnings as errors

Testing:
- macos builds pass
- there are some test failures on updated macos, probably problem in test environment, seem to be hostname related -> to be fixed (either here, or in separate PR)

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Commit messages:
 - GHA: update to macos-13

Changes: https://git.openjdk.org/jdk8u-dev/pull/544/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=544&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318039
  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/544.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/544/head:pull/544

PR: https://git.openjdk.org/jdk8u-dev/pull/544